Effects of number and location of bins on plastic recycling at a university.

The team moved plastic-bottle recycling bins around a university. They tried bins in hallways, bins in classrooms, more bins, fewer bins.

Each move lasted a few days. They counted bottles in the bins at the end of every class day.

Recycling tripled when bins were inside classrooms. Moving or adding bins in hallways did nothing.

No signs, no talks, no extra staff—just the new bin spot.

Fritz et al. (2017) later got the same jump in recycling by doing the opposite: they yanked trash cans from classrooms. Both tricks make the right choice easier.

Capehart et al. (1980) doubled stadium litter in a can by adding a bright plywood “har.” Like Munce et al. (2010), a tiny visual tweak drove big behavior change.

Thompson et al. (1974) and Gardner et al. (2009) also used fast-switching classroom tests, showing the design works for any small change you want to check.

You can boost eco-behavior without lectures or rewards. If you want more recycling in your school, wheel the bin into the classroom and watch the bottles pile up. Try it next week—one move, big gain.